My 2006 Silverado's airconditioner blows cold air for about 5 minutes then blows hot air only. This varies however, sometimes it blows cold for 1 minute, sometimes for 15 min. Whats up with this? My mechanic said there was nothing wrong! Any help will be much appreciated! It's hot in Kansas!!!

Topics regarding the climate control in the cabin. Discuss things like air conditioning, refrigerant recharging, and dual climate controls, a/c vents, accumulator or defrosters, heater core, or fan inside the truck.